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Home / DTC / C1231 — Low Pressure Sensor

C1231 — Low Pressure Sensor

Detailed page for trouble code C1231.

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C1231

HYUNDAI C — Chassis

Low Pressure Sensor

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 12 EN: 21 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted sensor wiring (signal, reference, or ground)
  • Corroded or loose connector pins at the sensor or ECU
  • Failed pressure sensor (internally shorted or open)
  • Blown fuse or failed power/ground for sensor circuit
  • Actual low hydraulic/fuel/transmission pressure due to leak or mechanical failure
  • Intermittent connector contact due to contamination or vibration

Symptoms

  • Warning lamp(s) illuminated (ABS, brake, transmission, or engine MIL)
  • Fault stored in ECU with related functionality limited (reduced braking/trac/shift logic)
  • Loss of ABS or traction control functionality
  • Brake pedal feel abnormal if brake hydraulic pressure affected
  • Shift/harshness issues or limp-home mode if transmission/fuel pressure affected
  • Intermittent or persistent fault depending on wiring condition

What to check

  • Retrieve freeze frame data and full trouble code list with a diagnostic scanner
  • Identify exact sensor location and circuit using vehicle service manual/wiring diagrams
  • Visually inspect sensor and connector for damage, corrosion, deformation or fluid ingress
  • Check and record PCM/ABS/fuse box fuses and relays related to the sensor circuit
  • Wiggle-test wiring harness while monitoring live data for intermittent dropouts
  • Inspect associated system fluid level and for obvious leaks (brake, transmission, fuel)

Signal parameters

  • Reference supply (typical): ~5.0 V from ECU (verify exact spec in service manual)
  • Signal output (typical): ~0.5–4.5 V proportional to pressure — low pressure near lower end (often ~0.5–1.0 V)
  • Sensor ground: near 0.0 V (good chassis/ECU ground)
  • Resistance: some pressure sensors show variable ohms across pressure range — consult service manual for exact ohm values
  • Note: exact voltages/ohms vary by model and sensor type — always confirm with Hyundai specifications

Diagnostic algorithm

  1. Connect a scan tool and read DTCs, live data and relevant freeze frame values to confirm conditions when the fault set
  2. Identify the exact sensor (brake hydraulic pressure, transmission oil pressure, fuel pressure, etc.) for the vehicle model using factory documentation
  3. Perform visual inspection of sensor, connector, and harness for damage, corrosion, fluid contamination or loose pins
  4. With ignition ON (engine off), measure: a) reference supply voltage at the sensor connector, b) signal voltage at the sensor connector, and c) sensor ground continuity to battery negative — compare to spec
  5. If supply or ground missing, trace and repair wiring, fuses or relays supplying the sensor
  6. If supply and ground present but signal low, back-probe connector and try a known-good sensor (if available) or bench-test sensor per service manual
  7. Wiggle harness while monitoring live signal to find intermittent faults
  8. If wiring and sensor check good, inspect system fluid level and for leaks and repair as needed (brake lines, transmission cooler lines, fuel lines)
  9. If all checks pass and sensor replacement performed, clear codes and perform road test to confirm fault does not return
  10. If fault persists with verified good sensor and wiring, consider replacing or testing the controlling module per manufacturer procedure

Likely causes

  • Damaged or chafed wiring harness to the pressure sensor
  • Water ingress/corrosion in sensor connector
  • Sensor failed from age or contamination
  • Low system fluid level or leak causing true low pressure
  • Blown sensor supply fuse or faulty sensor ground

Fault status

⚠️ Status
Code C1231 indicates a low or abnormally low signal from the pressure sensor circuit. The condition may be due to a wiring fault, sensor failure, or actual low system pressure. Symptoms may include warning lamps and reduced system functionality. Verify sensor type and follow vehicle-specific procedures.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1230 C1232 C1241 C1250 C1201
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Code

C1231

MITSUBISHI C — Chassis

FR outlet valve

Brand: MITSUBISHI
Type: C — Chassis
Views: UK: 7 EN: 16 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted sensor wiring (signal, reference, or ground)
  • Corroded or loose connector pins at the sensor or ECU
  • Failed pressure sensor (internally shorted or open)
  • Blown fuse or failed power/ground for sensor circuit
  • Actual low hydraulic/fuel/transmission pressure due to leak or mechanical failure
  • Intermittent connector contact due to contamination or vibration

Symptoms

  • Warning lamp(s) illuminated (ABS, brake, transmission, or engine MIL)
  • Fault stored in ECU with related functionality limited (reduced braking/trac/shift logic)
  • Loss of ABS or traction control functionality
  • Brake pedal feel abnormal if brake hydraulic pressure affected
  • Shift/harshness issues or limp-home mode if transmission/fuel pressure affected
  • Intermittent or persistent fault depending on wiring condition

What to check

  • Retrieve freeze frame data and full trouble code list with a diagnostic scanner
  • Identify exact sensor location and circuit using vehicle service manual/wiring diagrams
  • Visually inspect sensor and connector for damage, corrosion, deformation or fluid ingress
  • Check and record PCM/ABS/fuse box fuses and relays related to the sensor circuit
  • Wiggle-test wiring harness while monitoring live data for intermittent dropouts
  • Inspect associated system fluid level and for obvious leaks (brake, transmission, fuel)

Signal parameters

  • Reference supply (typical): ~5.0 V from ECU (verify exact spec in service manual)
  • Signal output (typical): ~0.5–4.5 V proportional to pressure — low pressure near lower end (often ~0.5–1.0 V)
  • Sensor ground: near 0.0 V (good chassis/ECU ground)
  • Resistance: some pressure sensors show variable ohms across pressure range — consult service manual for exact ohm values
  • Note: exact voltages/ohms vary by model and sensor type — always confirm with Hyundai specifications

Diagnostic algorithm

  1. Connect a scan tool and read DTCs, live data and relevant freeze frame values to confirm conditions when the fault set
  2. Identify the exact sensor (brake hydraulic pressure, transmission oil pressure, fuel pressure, etc.) for the vehicle model using factory documentation
  3. Perform visual inspection of sensor, connector, and harness for damage, corrosion, fluid contamination or loose pins
  4. With ignition ON (engine off), measure: a) reference supply voltage at the sensor connector, b) signal voltage at the sensor connector, and c) sensor ground continuity to battery negative — compare to spec
  5. If supply or ground missing, trace and repair wiring, fuses or relays supplying the sensor
  6. If supply and ground present but signal low, back-probe connector and try a known-good sensor (if available) or bench-test sensor per service manual
  7. Wiggle harness while monitoring live signal to find intermittent faults
  8. If wiring and sensor check good, inspect system fluid level and for leaks and repair as needed (brake lines, transmission cooler lines, fuel lines)
  9. If all checks pass and sensor replacement performed, clear codes and perform road test to confirm fault does not return
  10. If fault persists with verified good sensor and wiring, consider replacing or testing the controlling module per manufacturer procedure

Likely causes

  • Damaged or chafed wiring harness to the pressure sensor
  • Water ingress/corrosion in sensor connector
  • Sensor failed from age or contamination
  • Low system fluid level or leak causing true low pressure
  • Blown sensor supply fuse or faulty sensor ground

Fault status

⚠️ Status
Code C1231 indicates a low or abnormally low signal from the pressure sensor circuit. The condition may be due to a wiring fault, sensor failure, or actual low system pressure. Symptoms may include warning lamps and reduced system functionality. Verify sensor type and follow vehicle-specific procedures.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1230 C1232 C1241 C1250 C1201
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1231

Other C — Chassis

Speed Wheel Sensor Rear Center Circuit Open

Brand: Other
Type: C — Chassis
Views: UK: 16 EN: 31 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted sensor wiring (signal, reference, or ground)
  • Corroded or loose connector pins at the sensor or ECU
  • Failed pressure sensor (internally shorted or open)
  • Blown fuse or failed power/ground for sensor circuit
  • Actual low hydraulic/fuel/transmission pressure due to leak or mechanical failure
  • Intermittent connector contact due to contamination or vibration

Symptoms

  • Warning lamp(s) illuminated (ABS, brake, transmission, or engine MIL)
  • Fault stored in ECU with related functionality limited (reduced braking/trac/shift logic)
  • Loss of ABS or traction control functionality
  • Brake pedal feel abnormal if brake hydraulic pressure affected
  • Shift/harshness issues or limp-home mode if transmission/fuel pressure affected
  • Intermittent or persistent fault depending on wiring condition

What to check

  • Retrieve freeze frame data and full trouble code list with a diagnostic scanner
  • Identify exact sensor location and circuit using vehicle service manual/wiring diagrams
  • Visually inspect sensor and connector for damage, corrosion, deformation or fluid ingress
  • Check and record PCM/ABS/fuse box fuses and relays related to the sensor circuit
  • Wiggle-test wiring harness while monitoring live data for intermittent dropouts
  • Inspect associated system fluid level and for obvious leaks (brake, transmission, fuel)

Signal parameters

  • Reference supply (typical): ~5.0 V from ECU (verify exact spec in service manual)
  • Signal output (typical): ~0.5–4.5 V proportional to pressure — low pressure near lower end (often ~0.5–1.0 V)
  • Sensor ground: near 0.0 V (good chassis/ECU ground)
  • Resistance: some pressure sensors show variable ohms across pressure range — consult service manual for exact ohm values
  • Note: exact voltages/ohms vary by model and sensor type — always confirm with Hyundai specifications

Diagnostic algorithm

  1. Connect a scan tool and read DTCs, live data and relevant freeze frame values to confirm conditions when the fault set
  2. Identify the exact sensor (brake hydraulic pressure, transmission oil pressure, fuel pressure, etc.) for the vehicle model using factory documentation
  3. Perform visual inspection of sensor, connector, and harness for damage, corrosion, fluid contamination or loose pins
  4. With ignition ON (engine off), measure: a) reference supply voltage at the sensor connector, b) signal voltage at the sensor connector, and c) sensor ground continuity to battery negative — compare to spec
  5. If supply or ground missing, trace and repair wiring, fuses or relays supplying the sensor
  6. If supply and ground present but signal low, back-probe connector and try a known-good sensor (if available) or bench-test sensor per service manual
  7. Wiggle harness while monitoring live signal to find intermittent faults
  8. If wiring and sensor check good, inspect system fluid level and for leaks and repair as needed (brake lines, transmission cooler lines, fuel lines)
  9. If all checks pass and sensor replacement performed, clear codes and perform road test to confirm fault does not return
  10. If fault persists with verified good sensor and wiring, consider replacing or testing the controlling module per manufacturer procedure

Likely causes

  • Damaged or chafed wiring harness to the pressure sensor
  • Water ingress/corrosion in sensor connector
  • Sensor failed from age or contamination
  • Low system fluid level or leak causing true low pressure
  • Blown sensor supply fuse or faulty sensor ground

Fault status

⚠️ Status
Code C1231 indicates a low or abnormally low signal from the pressure sensor circuit. The condition may be due to a wiring fault, sensor failure, or actual low system pressure. Symptoms may include warning lamps and reduced system functionality. Verify sensor type and follow vehicle-specific procedures.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C1230 C1232 C1241 C1250 C1201
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